Benzothiazole-based colorimetric chemosensors bearing naphthol aldehyde unit: Synthesis, characterization, selective detection of hypochlorite and its application as test strips

•BTNA1 can be utilized as a colorimetric chemosensor for detection of ClO− anion.•BTNA1 is novel benzothiazole-based colorimetric chemosensors bearing naphthol aldehyde unit.•BTNA1 showed excellent selectivity toward ClO− over the other competitive anions.